SCP-1048 can be found wandering aimlessly around the large testing chamber. If the player walks up to it it'll begin walking away from them. When the player looks away from it then looks back it'll be gone.
SCP-1048 can occasionally be seen dancing inside the observatory room of the checkpoint rooms.
SCP-1048 can also be encountered in the three-way gas catwalk, making drawings with a pen and paper. If the player walks up to it it will hold up a drawing that it made, which the player can then pick up. Each drawing represents D-9341 in some form of peril. As soon as the player picks up the drawing SCP-1048 will disappear.
SpoilerAll the drawings can be found here since I'm not about to link each one individually: http://scpcb.gamepedia.com/SCP-1048#Drawings
SCP-1048-A is a hostile offshoot of SCP-1048. It can sometimes be encountered in one of the light containment zone hallways. If the player comes into contact with it, it will begin screeching, causing the player's vision to shake and for ears to start forming on their body. If the player remains close to SCP-1048-A for too long after the ears begin forming, they will suffocate.